257 SYW primer pockets

I have been having problems with primer pockets expanding with my 257 stw. This is happening sometimes after one firing and with mild loads, no excessive pressure at all. I have 2 friends that also are having the exact same problem. I thought it was the Remington brass but I tried some Winchester and I'm having the same problem.
I know there seems to be some people on here shooting the 257 stw and i was wondering if you were having similar problems or if anyone had any possible solutions.
Thanks, Gary

I have been having problems with primer pockets expanding with my 257 stw. This is happening sometimes after one firing and with mild loads, no excessive pressure at all. I have 2 friends that also are having the exact same problem. I thought it was the Remington brass but I tried some Winchester and I'm having the same problem.
I know there seems to be some people on here shooting the 257 stw and i was wondering if you were having similar problems or if anyone had any possible solutions.
Thanks, Gary

Click to expand...

The stretching of primer pockets is most definately a sign of excess pressure......Wouldn't this post fit better in the reloading section?

It isn't pressure as all 3 of us have loaded way down. I tried loads that were 5 grains lower than the listed starting load. 100 grain ballsitic tip with 70 grains of Ram Shot Magnum and the pocket expanded after one firing.

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